#9988 NORM 1.5-sof: XO-1.5 disk activity light doesn't work

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#9988: XO-1.5 disk activity light doesn't work
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           Reporter:  wad     |       Owner:  dsaxena                          
               Type:  defect  |      Status:  new                              
           Priority:  normal  |   Milestone:  1.5-software-later               
          Component:  kernel  |     Version:  Development build as of this date
         Resolution:          |    Keywords:                                   
        Next_action:  design  |    Verified:  0                                
Deployment_affected:          |   Blockedby:                                   
           Blocking:          |  
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Comment(by Quozl):

 I agree the kernel LED subsystem is probably a nicer place to do this
 rather than hacking in GPIO manipulation into the mmc/card/block.c ...
 I've thought about human interface and usability a bit more ... and came
 up with an alternate semantics:

  * short flashes for reads in the absence of writes,
  * long flashes for writes,
  * constant on for a long write queue,

 There's also some really neat functionality lurking in the LED driver that
 someone might like to consider for power limited deployments ... for
 example expressing the battery drain current using the heartbeat LED
 trigger, which currently is based on 1min load average (led_heartbeat* in
 drivers/leds/ledtrig-heartbeat.c) ... by giving immediate feedback of
 power consumption the child will learn how to optimise their running time.

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Ticket URL: <http://dev.laptop.org/ticket/9988#comment:3>
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